Karen Matthews, then 33, was jailed for eight years for her part in what a judge described as a "truly despicable" plot with Michael Donovan, in whose flat the youngster was found. Donovan, then 40, was also jailed for eight years.

Prosecutors said Donovan kept Shannon imprisoned as part of a plan he and Matthews hatched.

The ordeal has left Shannon "disturbed and traumatised" and suffering from nightmares.